\chapter{中英文缩写对照表}
\begin{center} \xiaosi
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    3D&Three-dimensional（三维）\\
    CT&Computer tomography (计算机断层层析成像)\\
    MRI&Magnetic resonance imaging（磁共振成像）\\
    PET&Positron emission computed tomography（正电子发射断层成像）\\
    …&
\end{tabular}
\end{center}  